includes/specials/SpecialRecentchangeslinked.php

   1 <?php
   2 /**
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  * http://www.gnu.org/copyleft/gpl.html
  18  */
  19
  20 /**
  21  * This is to display changes made to all articles linked in an article.
  22  * @ingroup SpecialPage
  23  */
  24 class SpecialRecentchangeslinked extends SpecialRecentchanges {
  25         var $rclTargetTitle;
  26
  27         function __construct(){
  28                 parent::__construct( 'Recentchangeslinked' );
  29         }
  30
  31         public function getDefaultOptions() {
  32                 $opts = parent::getDefaultOptions();
  33                 $opts->add( 'target', '' );
  34                 $opts->add( 'showlinkedto', false );
  35                 $opts->add( 'tagfilter', '' );
  36                 return $opts;
  37         }
  38
  39         public function parseParameters( $par, FormOptions $opts ) {
  40                 $opts['target'] = $par;
  41         }
  42
  43         public function feedSetup() {
  44                 global $wgRequest;
  45                 $opts = parent::feedSetup();
  46                 $opts['target'] = $wgRequest->getVal( 'target' );
  47                 return $opts;
  48         }
  49
  50         public function getFeedObject( $feedFormat ){
  51                 $feed = new ChangesFeed( $feedFormat, false );
  52                 $feedObj = $feed->getFeedObject(
  53                         wfMsgForContent( 'recentchangeslinked-title', $this->getTargetTitle()->getPrefixedText() ),
  54                         wfMsgForContent( 'recentchangeslinked-feed' )
  55                 );
  56                 return array( $feed, $feedObj );
  57         }
  58
  59         public function doMainQuery( $conds, $opts ) {
  60                 global $wgUser, $wgOut;
  61
  62                 $target = $opts['target'];
  63                 $showlinkedto = $opts['showlinkedto'];
  64                 $limit = $opts['limit'];
  65
  66                 if ( $target === '' ) {
  67                         return false;
  68                 }
  69                 $title = Title::newFromURL( $target );
  70                 if( !$title || $title->getInterwiki() != '' ){
  71                         $wgOut->wrapWikiMsg( "<div class=\"errorbox\">\n$1\n</div><br style=\"clear: both\" />", 'allpagesbadtitle' );
  72                         return false;
  73                 }
  74
  75                 $wgOut->setPageTitle( wfMsg( 'recentchangeslinked-title', $title->getPrefixedText() ) );
  76
  77                 /*
  78                  * Ordinary links are in the pagelinks table, while transclusions are
  79                  * in the templatelinks table, categorizations in categorylinks and
  80                  * image use in imagelinks.  We need to somehow combine all these.
  81                  * Special:Whatlinkshere does this by firing multiple queries and
  82                  * merging the results, but the code we inherit from our parent class
  83                  * expects only one result set so we use UNION instead.
  84                  */
  85
  86                 $dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
  87                 $id = $title->getArticleId();
  88                 $ns = $title->getNamespace();
  89                 $dbkey = $title->getDBkey();
  90
  91                 $tables = array( 'recentchanges' );
  92                 $select = array( $dbr->tableName( 'recentchanges' ) . '.*' );
  93                 $join_conds = array();
  94                 $query_options = array();
  95
  96                 // left join with watchlist table to highlight watched rows
  97                 if( $uid = $wgUser->getId() ) {
  98                         $tables[] = 'watchlist';
  99                         $select[] = 'wl_user';
 100                         $join_conds['watchlist'] = array( 'LEFT JOIN', "wl_user={$uid} AND wl_title=rc_title AND wl_namespace=rc_namespace" );
 101                 }
 102                 if ( $wgUser->isAllowed( 'rollback' ) ) {
 103                         $tables[] = 'page';
 104                         $join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
 105                         $select[] = 'page_latest';
 106                 }
 107                 if ( !$this->including() ) { // bug 23293
 108                         ChangeTags::modifyDisplayQuery( $tables, $select, $conds, $join_conds,
 109                                 $query_options, $opts['tagfilter'] );
 110                 }
 111
 112                 if ( !wfRunHooks( 'SpecialRecentChangesQuery', array( &$conds, &$tables, &$join_conds, $opts, &$query_options ) ) )
 113                         return false;
 114
 115                 if( $ns == NS_CATEGORY && !$showlinkedto ) {
 116                         // special handling for categories
 117                         // XXX: should try to make this less klugy
 118                         $link_tables = array( 'categorylinks' );
 119                         $showlinkedto = true;
 120                 } else {
 121                         // for now, always join on these tables; really should be configurable as in whatlinkshere
 122                         $link_tables = array( 'pagelinks', 'templatelinks' );
 123                         // imagelinks only contains links to pages in NS_FILE
 124                         if( $ns == NS_FILE || !$showlinkedto ) $link_tables[] = 'imagelinks';
 125                 }
 126
 127                 if( $id == 0 && !$showlinkedto )
 128                         return false; // nonexistent pages can't link to any pages
 129
 130                 // field name prefixes for all the various tables we might want to join with
 131                 $prefix = array( 'pagelinks' => 'pl', 'templatelinks' => 'tl', 'categorylinks' => 'cl', 'imagelinks' => 'il' );
 132
 133                 $subsql = array(); // SELECT statements to combine with UNION
 134
 135                 foreach( $link_tables as $link_table ) {
 136                         $pfx = $prefix[$link_table];
 137
 138                         // imagelinks and categorylinks tables have no xx_namespace field, and have xx_to instead of xx_title
 139                         if( $link_table == 'imagelinks' ) $link_ns = NS_FILE;
 140                         else if( $link_table == 'categorylinks' ) $link_ns = NS_CATEGORY;
 141                         else $link_ns = 0;
 142
 143                         if( $showlinkedto ) {
 144                                 // find changes to pages linking to this page
 145                                 if( $link_ns ) {
 146                                         if( $ns != $link_ns ) continue; // should never happen, but check anyway
 147                                         $subconds = array( "{$pfx}_to" => $dbkey );
 148                                 } else {
 149                                         $subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
 150                                 }
 151                                 $subjoin = "rc_cur_id = {$pfx}_from";
 152                         } else {
 153                                 // find changes to pages linked from this page
 154                                 $subconds = array( "{$pfx}_from" => $id );
 155                                 if( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
 156                                         $subconds["rc_namespace"] = $link_ns;
 157                                         $subjoin = "rc_title = {$pfx}_to";
 158                                 } else {
 159                                         $subjoin = "rc_namespace = {$pfx}_namespace AND rc_title = {$pfx}_title";
 160                                 }
 161                         }
 162
 163                         if( $dbr->unionSupportsOrderAndLimit())
 164                                 $order = array( 'ORDER BY' => 'rc_timestamp DESC' );
 165                         else
 166                                 $order = array();
 167
 168
 169                         $query = $dbr->selectSQLText(
 170                                 array_merge( $tables, array( $link_table ) ),
 171                                 $select,
 172                                 $conds + $subconds,
 173                                 __METHOD__,
 174                                 $order + $query_options,
 175                                 $join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) )
 176                         );
 177
 178                         if( $dbr->unionSupportsOrderAndLimit())
 179                                 $query = $dbr->limitResult( $query, $limit );
 180
 181                         $subsql[] = $query;
 182                 }
 183
 184                 if( count($subsql) == 0 )
 185                         return false; // should never happen
 186                 if( count($subsql) == 1 && $dbr->unionSupportsOrderAndLimit() )
 187                         $sql = $subsql[0];
 188                 else {
 189                         // need to resort and relimit after union
 190                         $sql = $dbr->unionQueries($subsql, false).' ORDER BY rc_timestamp DESC';
 191                         $sql = $dbr->limitResult($sql, $limit, false);
 192                 }
 193
 194                 $res = $dbr->query( $sql, __METHOD__ );
 195
 196                 if( $res->numRows() == 0 )
 197                         $this->mResultEmpty = true;
 198
 199                 return $res;
 200         }
 201
 202         function getExtraOptions( $opts ){
 203                 $opts->consumeValues( array( 'showlinkedto', 'target', 'tagfilter' ) );
 204                 $extraOpts = array();
 205                 $extraOpts['namespace'] = $this->namespaceFilterForm( $opts );
 206                 $extraOpts['target'] = array( wfMsgHtml( 'recentchangeslinked-page' ),
 207                         Xml::input( 'target', 40, str_replace('_',' ',$opts['target']) ) .
 208                         Xml::check( 'showlinkedto', $opts['showlinkedto'], array('id' => 'showlinkedto') ) . ' ' .
 209                         Xml::label( wfMsg("recentchangeslinked-to"), 'showlinkedto' ) );
 210                 $tagFilter = ChangeTags::buildTagFilterSelector( $opts['tagfilter'] );
 211                 if ($tagFilter)
 212                         $extraOpts['tagfilter'] = $tagFilter;
 213                 return $extraOpts;
 214         }
 215
 216         function getTargetTitle() {
 217                 if ( $this->rclTargetTitle === null ) {
 218                         $opts = $this->getOptions();
 219                         if ( isset( $opts['target'] ) && $opts['target'] !== '' ) {
 220                                 $this->rclTargetTitle = Title::newFromText( $opts['target'] );
 221                         } else {
 222                                 $this->rclTargetTitle = false;
 223                         }
 224                 }
 225                 return $this->rclTargetTitle;
 226         }
 227
 228         function setTopText( OutputPage $out, FormOptions $opts ) {
 229                 global $wgUser;
 230                 $skin = $wgUser->getSkin();
 231                 $target = $this->getTargetTitle();
 232                 if( $target )
 233                         $out->setSubtitle( wfMsg( 'recentchangeslinked-backlink', $skin->link( $target,
 234                                 $target->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
 235         }
 236
 237         public function getFeedQuery() {
 238                 $target = $this->getTargetTitle();
 239                 if( $target ) {
 240                         return "target=" . urlencode( $target->getPrefixedDBkey() );
 241                 } else {
 242                         return false;
 243                 }
 244         }
 245
 246         function setBottomText( OutputPage $out, FormOptions $opts ) {
 247                 if( isset( $this->mResultEmpty ) && $this->mResultEmpty ){
 248                         $out->addWikiMsg( 'recentchangeslinked-noresult' );
 249                 }
 250         }
 251 }